Steam-boiler stay-bolt plug.



I 1,172,350, Patented Feb. 22,1916.

B. B. FREER.

STEAM BOILER STAY BOLT PLUG.

APPLICATION mm FEB. 3. 1915.

WITNESSES INVENTOR To all whom may concern:

Bonn B. FREEZE, or 01:. CITY, PENNSYLVA IA.

swam-sorter. s'rAr-Borir PLUG.

Specification of Letters Patent.

Application filed February'ii, 1915. Serial No. 5,873. j

Be it known that I, Bonn BZFREER, a citizen of the United States,residing at Oil City, in the county of Venango and'State ofPennsylvania, have invented new and useful Improvements in Steam-BoilerStay- Bolt Plugs, of which the following is a specification; V 1

My invention relates to steam-boilers of the water-tube type, and moreparticularly.

to the sub-type thereof having the ends of the water-tubes communicatingwith waterlegs. 1

It is the object of my invention to provide the hollow" stay-bolts forthe sides of the water legs with preferably non corrosive metal plugs toprevent the air from shortcircuiting the fire grate or burners beneaththe water-tubes. j

Referring to the accompanying drawing, Figure 1 is an elevation,partlyin section, of a portion of a steam-boiler; Fig. 2, an enlargedview showing a portion of a Stay-bolt in one wall of a water-leg, andone of my plugs in the stay-bolt; Fig; 3, a'side elevation, partly insection, showing the preferred form of my stay-bolt plug; and Fig. 1, anend view of a portion of the outer wall of a water-leg with one ofmyplugs in a stay-bolt.

On the drawing, 1 designates a horizontal boiler, only one end portionthereof being shown.

2 is a'water-leg secured to the under side of the boiler 1 and providedwith the opposite nearly vertical side-walls 3 and 4, and the end-Walls5 and 6. y

7 and 8 are the water-tubes which have their ends secured in the innerwall 1 and opening into the water-leg 2. The walls 3 and 4: are tiedtogether by numerous hollow stay-bolts, only one, marked 9, being shown.The stay-bolts are threaded externally and screwed into the walls 3 and1 whereby the walls 3 and 4 are prevented from changing their relativepositions, such as spreading.

If the stay-bolts have their central, or axial, openings left open,considerable air will pass through them instead of going through theusual fire-grate or burners beneath the water-tubes. To prevent the airfrom short-circuiting or bypassing the gratev or burners, I provide foreach stay-bolt the plug comprising the closure member 10 and the closureretaining and operating member :brass or other'non-corrosive substance.

r mmed Feb. 22, 1915.

11'. The member'10 is preferably tapered on one face, marked 12, andplane on the opposite face,-marked 13.- The member'll is composedofpreferably a single piece of resilient wire which I prefer to ,make ofThe member 11 has its central portion bent back *on itself to form theloop 14'. The free'ends of the member 11 form legsl5 which lie one overthe other and are spread apart so that they will simultaneously engagediametrically oppositeportions of the interior'wall of the axialopening16 in the stay-bolt and to exert sufiicient pressure on the saidwall to prevent the member 10,1which is carried by the intermediateportion 17 of the 11181117 ber 11, from moving fromits normalposisaidintermediate portion of the member 11 tion, which is shown on Figs. 1and 2. The

and the legs 15 extending beyond the coniparallel, or in contact, withthe wall. of the stay-bolt opening 16 so as to hold the member 11in linewith the stay-bolt and the member 10 in close contact with the outer.end of the stay-bolt with the conical face 12 pro ecting for somedistance into the said 'cal face 12. The legs 15 of the member 11 Ihave. considerable portions thereof lying make the ends of'the legs 15inclined toward f each other as shown at 17.

I prefer that the'two members 10 and 11 shallcbe made of such materialas will not rust or corrode in the stay-bolt and thereby prevent theready removal of, the plug. For example, the member. 10 may be made ofBabbitt metal or lead, and the member 11 of brass or bronze. The loop141 provides a convenient piece which the fingers may grasp or anextracting tool may be applied. I do not limit myself to the definiteshapes of the members 10 and '11 shown on the drawings.

1. In a steam-boiler, a stay-bolt with an opening throughout its length,a closure for the opening, and a retaining member extending through theclosure and having at one end a resilient portion in engagement with thewall of the opening and at the other opening throughout its length, anon-corrosive closure for the'opening, and a non-cor rosive retainingmember extending through they closure and having at one end a resilientportion 111 engagement with the Wall of the opening and at the other enda suitable finger piece.- I

3. In a steam-boiler, a stay-bolt with. an

opening throughout its length, a closure for Copies of this patent maybe obtained for distance as to prevent the closure from mov-- ingdownwardly 4. In a steu1n-boiler, a, stay-bolt "with an openingthroughout lts length, ,a stopper for the opening,;ancl a retainingmember extend ing through'the closure, rigidly connected to the stopperand having at one end a resilient portion in. engagement With the Walloiitheopening.

Signed at Pittsburgh, Pa, of January, A. D. 1915.

BURR B. FREEZER Witnesses.

ALICE E. DUFF, F. N. BARBER.

five cents each, by addressing the fCommissioner ofla'tents,-Washington, D; C. e i

this 28th day

